An individual was on Friday being treated at Sweden’s Uppsala University Hospital with a case of “suspected Ebola infection”, according to the regional authority.
The patient, who was not named, had been transferred to isolation, Uppsala regional council said in a statement.
It did not confirm the person definitely had the Ebola virus and said “other diseases are quite possible”.
Test results were expected to be published on Friday evening.
Patients who intended to go to the A&E at Enköping hospital were told to go instead to a primary care provider or the University Hospital in Uppsala, the authority added.
Symptoms of the virus include fever and abdominal pain as many as three weeks after a person came into contact with it, according to the US Centers for Disease Control and Prevention.
The Ebola epidemic in West Africa ended two years ago after claiming the lives of as many as 11,300 people across Sierra Leone, Liberia and Guinea.